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<pre><span class="sourceLineNo">001</span><a name="line.1"></a>
<span class="sourceLineNo">002</span>/*<a name="line.2"></a>
<span class="sourceLineNo">003</span> * Copyright (C) 2014 Archie L. Cobbs. All rights reserved.<a name="line.3"></a>
<span class="sourceLineNo">004</span> *<a name="line.4"></a>
<span class="sourceLineNo">005</span> * $Id: TCPNetwork.html 939 2015-05-29 01:16:17Z archie.cobbs $<a name="line.5"></a>
<span class="sourceLineNo">006</span> */<a name="line.6"></a>
<span class="sourceLineNo">007</span><a name="line.7"></a>
<span class="sourceLineNo">008</span>package org.jsimpledb.kv.raft.net;<a name="line.8"></a>
<span class="sourceLineNo">009</span><a name="line.9"></a>
<span class="sourceLineNo">010</span>import java.io.IOException;<a name="line.10"></a>
<span class="sourceLineNo">011</span>import java.net.InetSocketAddress;<a name="line.11"></a>
<span class="sourceLineNo">012</span>import java.net.SocketAddress;<a name="line.12"></a>
<span class="sourceLineNo">013</span>import java.nio.ByteBuffer;<a name="line.13"></a>
<span class="sourceLineNo">014</span>import java.nio.channels.ClosedSelectorException;<a name="line.14"></a>
<span class="sourceLineNo">015</span>import java.nio.channels.SelectionKey;<a name="line.15"></a>
<span class="sourceLineNo">016</span>import java.nio.channels.Selector;<a name="line.16"></a>
<span class="sourceLineNo">017</span>import java.nio.channels.ServerSocketChannel;<a name="line.17"></a>
<span class="sourceLineNo">018</span>import java.nio.channels.SocketChannel;<a name="line.18"></a>
<span class="sourceLineNo">019</span>import java.util.ArrayList;<a name="line.19"></a>
<span class="sourceLineNo">020</span>import java.util.HashMap;<a name="line.20"></a>
<span class="sourceLineNo">021</span>import java.util.Iterator;<a name="line.21"></a>
<span class="sourceLineNo">022</span>import java.util.concurrent.ExecutorService;<a name="line.22"></a>
<span class="sourceLineNo">023</span>import java.util.concurrent.Executors;<a name="line.23"></a>
<span class="sourceLineNo">024</span>import java.util.concurrent.TimeUnit;<a name="line.24"></a>
<span class="sourceLineNo">025</span>import java.util.regex.Matcher;<a name="line.25"></a>
<span class="sourceLineNo">026</span>import java.util.regex.Pattern;<a name="line.26"></a>
<span class="sourceLineNo">027</span><a name="line.27"></a>
<span class="sourceLineNo">028</span>import org.slf4j.Logger;<a name="line.28"></a>
<span class="sourceLineNo">029</span>import org.slf4j.LoggerFactory;<a name="line.29"></a>
<span class="sourceLineNo">030</span><a name="line.30"></a>
<span class="sourceLineNo">031</span>/**<a name="line.31"></a>
<span class="sourceLineNo">032</span> * {@link Network} implementation based on TCP sockets.<a name="line.32"></a>
<span class="sourceLineNo">033</span> *<a name="line.33"></a>
<span class="sourceLineNo">034</span> * &lt;p&gt;<a name="line.34"></a>
<span class="sourceLineNo">035</span> * Remote peers have the {@link String} form &lt;code&gt;IP-Address[:port]&lt;/code&gt;. If the port is omitted,<a name="line.35"></a>
<span class="sourceLineNo">036</span> * {@link #DEFAULT_TCP_PORT} is assumed.<a name="line.36"></a>
<span class="sourceLineNo">037</span> * &lt;/p&gt;<a name="line.37"></a>
<span class="sourceLineNo">038</span> */<a name="line.38"></a>
<span class="sourceLineNo">039</span>public class TCPNetwork extends SelectorSupport implements Network {<a name="line.39"></a>
<span class="sourceLineNo">040</span><a name="line.40"></a>
<span class="sourceLineNo">041</span>    /**<a name="line.41"></a>
<span class="sourceLineNo">042</span>     * Default TCP port ({@value #DEFAULT_TCP_PORT}).<a name="line.42"></a>
<span class="sourceLineNo">043</span>     *<a name="line.43"></a>
<span class="sourceLineNo">044</span>     * @see #getListenAddress<a name="line.44"></a>
<span class="sourceLineNo">045</span>     */<a name="line.45"></a>
<span class="sourceLineNo">046</span>    public static final int DEFAULT_TCP_PORT = 9660;<a name="line.46"></a>
<span class="sourceLineNo">047</span><a name="line.47"></a>
<span class="sourceLineNo">048</span>    /**<a name="line.48"></a>
<span class="sourceLineNo">049</span>     * Default maximum number of simultaneous connections ({@value #DEFAULT_MAX_CONNECTIONS}).<a name="line.49"></a>
<span class="sourceLineNo">050</span>     *<a name="line.50"></a>
<span class="sourceLineNo">051</span>     * @see #getMaxConnections<a name="line.51"></a>
<span class="sourceLineNo">052</span>     */<a name="line.52"></a>
<span class="sourceLineNo">053</span>    public static final int DEFAULT_MAX_CONNECTIONS = 1000;<a name="line.53"></a>
<span class="sourceLineNo">054</span><a name="line.54"></a>
<span class="sourceLineNo">055</span>    /**<a name="line.55"></a>
<span class="sourceLineNo">056</span>     * Default idle connection timeout ({@value #DEFAULT_MAX_IDLE_TIME} milliseconds).<a name="line.56"></a>
<span class="sourceLineNo">057</span>     *<a name="line.57"></a>
<span class="sourceLineNo">058</span>     * @see #getMaxIdleTime<a name="line.58"></a>
<span class="sourceLineNo">059</span>     */<a name="line.59"></a>
<span class="sourceLineNo">060</span>    public static final long DEFAULT_MAX_IDLE_TIME = 30 * 1000L;                // 30 sec<a name="line.60"></a>
<span class="sourceLineNo">061</span><a name="line.61"></a>
<span class="sourceLineNo">062</span>    /**<a name="line.62"></a>
<span class="sourceLineNo">063</span>     * Default connect timeout for outgoing connections ({@value #DEFAULT_CONNECT_TIMEOUT} milliseconds).<a name="line.63"></a>
<span class="sourceLineNo">064</span>     *<a name="line.64"></a>
<span class="sourceLineNo">065</span>     * @see #getConnectTimeout<a name="line.65"></a>
<span class="sourceLineNo">066</span>     */<a name="line.66"></a>
<span class="sourceLineNo">067</span>    public static final long DEFAULT_CONNECT_TIMEOUT = 20 * 1000L;              // 20 sec<a name="line.67"></a>
<span class="sourceLineNo">068</span><a name="line.68"></a>
<span class="sourceLineNo">069</span>    /**<a name="line.69"></a>
<span class="sourceLineNo">070</span>     * Default maximum allowed size of an incoming message ({@value #DEFAULT_MAX_MESSAGE_SIZE} bytes).<a name="line.70"></a>
<span class="sourceLineNo">071</span>     *<a name="line.71"></a>
<span class="sourceLineNo">072</span>     * @see #getMaxMessageSize<a name="line.72"></a>
<span class="sourceLineNo">073</span>     */<a name="line.73"></a>
<span class="sourceLineNo">074</span>    public static final int DEFAULT_MAX_MESSAGE_SIZE = 32 * 1024 * 1024;        // 32 MB<a name="line.74"></a>
<span class="sourceLineNo">075</span><a name="line.75"></a>
<span class="sourceLineNo">076</span>    /**<a name="line.76"></a>
<span class="sourceLineNo">077</span>     * Default maximum allowed size of a connection's outgoing queue before we start dropping messages<a name="line.77"></a>
<span class="sourceLineNo">078</span>     * ({@value #DEFAULT_MAX_OUTPUT_QUEUE_SIZE} bytes).<a name="line.78"></a>
<span class="sourceLineNo">079</span>     *<a name="line.79"></a>
<span class="sourceLineNo">080</span>     * @see #getMaxOutputQueueSize<a name="line.80"></a>
<span class="sourceLineNo">081</span>     */<a name="line.81"></a>
<span class="sourceLineNo">082</span>    public static final long DEFAULT_MAX_OUTPUT_QUEUE_SIZE = 64 * 1024 * 1024;   // 64 MB<a name="line.82"></a>
<span class="sourceLineNo">083</span><a name="line.83"></a>
<span class="sourceLineNo">084</span>    private final Logger log = LoggerFactory.getLogger(this.getClass());<a name="line.84"></a>
<span class="sourceLineNo">085</span>    private final HashMap&lt;String, Connection&gt; connectionMap = new HashMap&lt;&gt;();<a name="line.85"></a>
<span class="sourceLineNo">086</span><a name="line.86"></a>
<span class="sourceLineNo">087</span>    private InetSocketAddress listenAddress = new InetSocketAddress(DEFAULT_TCP_PORT);<a name="line.87"></a>
<span class="sourceLineNo">088</span>    private int maxConnections = DEFAULT_MAX_CONNECTIONS;<a name="line.88"></a>
<span class="sourceLineNo">089</span>    private long maxIdleTime = DEFAULT_MAX_IDLE_TIME;<a name="line.89"></a>
<span class="sourceLineNo">090</span>    private long connectTimeout = DEFAULT_CONNECT_TIMEOUT;<a name="line.90"></a>
<span class="sourceLineNo">091</span>    private int maxMessageSize = DEFAULT_MAX_MESSAGE_SIZE;<a name="line.91"></a>
<span class="sourceLineNo">092</span>    private long maxOutputQueueSize = DEFAULT_MAX_OUTPUT_QUEUE_SIZE;<a name="line.92"></a>
<span class="sourceLineNo">093</span><a name="line.93"></a>
<span class="sourceLineNo">094</span>    private Network.Handler handler;<a name="line.94"></a>
<span class="sourceLineNo">095</span>    private ServerSocketChannel serverSocketChannel;<a name="line.95"></a>
<span class="sourceLineNo">096</span>    private SelectionKey selectionKey;<a name="line.96"></a>
<span class="sourceLineNo">097</span>    private ServiceThread serviceThread;<a name="line.97"></a>
<span class="sourceLineNo">098</span>    private ExecutorService executor;<a name="line.98"></a>
<span class="sourceLineNo">099</span>    private Selector selector;<a name="line.99"></a>
<span class="sourceLineNo">100</span><a name="line.100"></a>
<span class="sourceLineNo">101</span>// Public API<a name="line.101"></a>
<span class="sourceLineNo">102</span><a name="line.102"></a>
<span class="sourceLineNo">103</span>    /**<a name="line.103"></a>
<span class="sourceLineNo">104</span>     * Get the {@link InetSocketAddress} to which this instance is bound or will bind.<a name="line.104"></a>
<span class="sourceLineNo">105</span>     *<a name="line.105"></a>
<span class="sourceLineNo">106</span>     * @return listen address, possibly null for default behavior<a name="line.106"></a>
<span class="sourceLineNo">107</span>     */<a name="line.107"></a>
<span class="sourceLineNo">108</span>    public synchronized InetSocketAddress getListenAddress() {<a name="line.108"></a>
<span class="sourceLineNo">109</span>        return this.listenAddress;<a name="line.109"></a>
<span class="sourceLineNo">110</span>    }<a name="line.110"></a>
<span class="sourceLineNo">111</span><a name="line.111"></a>
<span class="sourceLineNo">112</span>    /**<a name="line.112"></a>
<span class="sourceLineNo">113</span>     * Configure the {@link InetSocketAddress} to which this instance should bind.<a name="line.113"></a>
<span class="sourceLineNo">114</span>     *<a name="line.114"></a>
<span class="sourceLineNo">115</span>     * &lt;p&gt;<a name="line.115"></a>
<span class="sourceLineNo">116</span>     * If this instance is already started, invoking this method will have no effect until it is<a name="line.116"></a>
<span class="sourceLineNo">117</span>     * {@linkplain #stop stopped} and restarted.<a name="line.117"></a>
<span class="sourceLineNo">118</span>     * &lt;/p&gt;<a name="line.118"></a>
<span class="sourceLineNo">119</span>     *<a name="line.119"></a>
<span class="sourceLineNo">120</span>     * &lt;p&gt;<a name="line.120"></a>
<span class="sourceLineNo">121</span>     * By default, instances listen on all interfaces on {@link #DEFAULT_TCP_PORT}.<a name="line.121"></a>
<span class="sourceLineNo">122</span>     * &lt;/p&gt;<a name="line.122"></a>
<span class="sourceLineNo">123</span>     *<a name="line.123"></a>
<span class="sourceLineNo">124</span>     * @param address listen address, or null to listen on all interfaces on {@link #DEFAULT_TCP_PORT}<a name="line.124"></a>
<span class="sourceLineNo">125</span>     * @throws IllegalArgumentException if {@code address} is null<a name="line.125"></a>
<span class="sourceLineNo">126</span>     */<a name="line.126"></a>
<span class="sourceLineNo">127</span>    public synchronized void setListenAddress(InetSocketAddress address) {<a name="line.127"></a>
<span class="sourceLineNo">128</span>        if (address == null)<a name="line.128"></a>
<span class="sourceLineNo">129</span>            throw new IllegalArgumentException();<a name="line.129"></a>
<span class="sourceLineNo">130</span>        this.listenAddress = address;<a name="line.130"></a>
<span class="sourceLineNo">131</span>    }<a name="line.131"></a>
<span class="sourceLineNo">132</span><a name="line.132"></a>
<span class="sourceLineNo">133</span>    /**<a name="line.133"></a>
<span class="sourceLineNo">134</span>     * Get the maximum number of allowed connections. Default is {@value #DEFAULT_MAX_CONNECTIONS}.<a name="line.134"></a>
<span class="sourceLineNo">135</span>     *<a name="line.135"></a>
<span class="sourceLineNo">136</span>     * @return max allowed connections<a name="line.136"></a>
<span class="sourceLineNo">137</span>     */<a name="line.137"></a>
<span class="sourceLineNo">138</span>    public synchronized int getMaxConnections() {<a name="line.138"></a>
<span class="sourceLineNo">139</span>        return this.maxConnections;<a name="line.139"></a>
<span class="sourceLineNo">140</span>    }<a name="line.140"></a>
<span class="sourceLineNo">141</span>    public synchronized void setMaxConnections(int maxConnections) {<a name="line.141"></a>
<span class="sourceLineNo">142</span>        this.maxConnections = maxConnections;<a name="line.142"></a>
<span class="sourceLineNo">143</span>    }<a name="line.143"></a>
<span class="sourceLineNo">144</span><a name="line.144"></a>
<span class="sourceLineNo">145</span>    /**<a name="line.145"></a>
<span class="sourceLineNo">146</span>     * Get the maximum idle time for connections before automatically closing them down.<a name="line.146"></a>
<span class="sourceLineNo">147</span>     * Default is {@value #DEFAULT_MAX_IDLE_TIME}ms.<a name="line.147"></a>
<span class="sourceLineNo">148</span>     *<a name="line.148"></a>
<span class="sourceLineNo">149</span>     * @return max connection idle time in milliseconds<a name="line.149"></a>
<span class="sourceLineNo">150</span>     */<a name="line.150"></a>
<span class="sourceLineNo">151</span>    public synchronized long getMaxIdleTime() {<a name="line.151"></a>
<span class="sourceLineNo">152</span>        return this.maxIdleTime;<a name="line.152"></a>
<span class="sourceLineNo">153</span>    }<a name="line.153"></a>
<span class="sourceLineNo">154</span>    public synchronized void setMaxIdleTime(long maxIdleTime) {<a name="line.154"></a>
<span class="sourceLineNo">155</span>        this.maxIdleTime = maxIdleTime;<a name="line.155"></a>
<span class="sourceLineNo">156</span>    }<a name="line.156"></a>
<span class="sourceLineNo">157</span><a name="line.157"></a>
<span class="sourceLineNo">158</span>    /**<a name="line.158"></a>
<span class="sourceLineNo">159</span>     * Get the outgoing connection timeout. Default is {@value #DEFAULT_CONNECT_TIMEOUT}ms.<a name="line.159"></a>
<span class="sourceLineNo">160</span>     *<a name="line.160"></a>
<span class="sourceLineNo">161</span>     * @return outgoing connection timeout in milliseconds<a name="line.161"></a>
<span class="sourceLineNo">162</span>     */<a name="line.162"></a>
<span class="sourceLineNo">163</span>    public synchronized long getConnectTimeout() {<a name="line.163"></a>
<span class="sourceLineNo">164</span>        return this.connectTimeout;<a name="line.164"></a>
<span class="sourceLineNo">165</span>    }<a name="line.165"></a>
<span class="sourceLineNo">166</span>    public synchronized void setConnectTimeout(long connectTimeout) {<a name="line.166"></a>
<span class="sourceLineNo">167</span>        this.connectTimeout = connectTimeout;<a name="line.167"></a>
<span class="sourceLineNo">168</span>    }<a name="line.168"></a>
<span class="sourceLineNo">169</span><a name="line.169"></a>
<span class="sourceLineNo">170</span>    /**<a name="line.170"></a>
<span class="sourceLineNo">171</span>     * Get the maximum allowed length for incoming messages. Default is {@value #DEFAULT_MAX_MESSAGE_SIZE} bytes.<a name="line.171"></a>
<span class="sourceLineNo">172</span>     *<a name="line.172"></a>
<span class="sourceLineNo">173</span>     * @return max allowed incoming message length in bytes<a name="line.173"></a>
<span class="sourceLineNo">174</span>     */<a name="line.174"></a>
<span class="sourceLineNo">175</span>    public synchronized int getMaxMessageSize() {<a name="line.175"></a>
<span class="sourceLineNo">176</span>        return this.maxMessageSize;<a name="line.176"></a>
<span class="sourceLineNo">177</span>    }<a name="line.177"></a>
<span class="sourceLineNo">178</span>    public synchronized void setMaxMessageSize(int maxMessageSize) {<a name="line.178"></a>
<span class="sourceLineNo">179</span>        this.maxMessageSize = maxMessageSize;<a name="line.179"></a>
<span class="sourceLineNo">180</span>    }<a name="line.180"></a>
<span class="sourceLineNo">181</span><a name="line.181"></a>
<span class="sourceLineNo">182</span>    /**<a name="line.182"></a>
<span class="sourceLineNo">183</span>     * Get the maximum allowed size of the queue for outgoing messages.<a name="line.183"></a>
<span class="sourceLineNo">184</span>     * Default is {@value #DEFAULT_MAX_OUTPUT_QUEUE_SIZE} bytes.<a name="line.184"></a>
<span class="sourceLineNo">185</span>     *<a name="line.185"></a>
<span class="sourceLineNo">186</span>     * @return max allowed outgoing message queue length in bytes<a name="line.186"></a>
<span class="sourceLineNo">187</span>     */<a name="line.187"></a>
<span class="sourceLineNo">188</span>    public synchronized long getMaxOutputQueueSize() {<a name="line.188"></a>
<span class="sourceLineNo">189</span>        return this.maxOutputQueueSize;<a name="line.189"></a>
<span class="sourceLineNo">190</span>    }<a name="line.190"></a>
<span class="sourceLineNo">191</span>    public synchronized void setMaxOutputQueueSize(long maxOutputQueueSize) {<a name="line.191"></a>
<span class="sourceLineNo">192</span>        this.maxOutputQueueSize = maxOutputQueueSize;<a name="line.192"></a>
<span class="sourceLineNo">193</span>    }<a name="line.193"></a>
<span class="sourceLineNo">194</span><a name="line.194"></a>
<span class="sourceLineNo">195</span>// Lifecycle<a name="line.195"></a>
<span class="sourceLineNo">196</span><a name="line.196"></a>
<span class="sourceLineNo">197</span>    /**<a name="line.197"></a>
<span class="sourceLineNo">198</span>     * Start this instance. Does nothing if already started.<a name="line.198"></a>
<span class="sourceLineNo">199</span>     *<a name="line.199"></a>
<span class="sourceLineNo">200</span>     * @throws IOException if server socket cannot be created<a name="line.200"></a>
<span class="sourceLineNo">201</span>     */<a name="line.201"></a>
<span class="sourceLineNo">202</span>    public synchronized void start(Handler handler) throws IOException {<a name="line.202"></a>
<span class="sourceLineNo">203</span>        if (this.serviceThread != null)<a name="line.203"></a>
<span class="sourceLineNo">204</span>            return;<a name="line.204"></a>
<span class="sourceLineNo">205</span>        if (this.log.isDebugEnabled())<a name="line.205"></a>
<span class="sourceLineNo">206</span>            this.log.debug("starting " + this + " listening on " + this.listenAddress);<a name="line.206"></a>
<span class="sourceLineNo">207</span>        boolean successful = false;<a name="line.207"></a>
<span class="sourceLineNo">208</span>        try {<a name="line.208"></a>
<span class="sourceLineNo">209</span>            this.selector = Selector.open();<a name="line.209"></a>
<span class="sourceLineNo">210</span>            this.serverSocketChannel = ServerSocketChannel.open();<a name="line.210"></a>
<span class="sourceLineNo">211</span>            this.configureServerSocketChannel(this.serverSocketChannel);<a name="line.211"></a>
<span class="sourceLineNo">212</span>            this.serverSocketChannel.configureBlocking(false);<a name="line.212"></a>
<span class="sourceLineNo">213</span>            this.serverSocketChannel.bind(this.listenAddress);<a name="line.213"></a>
<span class="sourceLineNo">214</span>            this.selectionKey = this.createSelectionKey(this.selector, this.serverSocketChannel, new IOHandler() {<a name="line.214"></a>
<span class="sourceLineNo">215</span>                @Override<a name="line.215"></a>
<span class="sourceLineNo">216</span>                public void serviceIO(SelectionKey key) throws IOException {<a name="line.216"></a>
<span class="sourceLineNo">217</span>                    if (key.isAcceptable())<a name="line.217"></a>
<span class="sourceLineNo">218</span>                        TCPNetwork.this.handleAccept();<a name="line.218"></a>
<span class="sourceLineNo">219</span>                }<a name="line.219"></a>
<span class="sourceLineNo">220</span>                @Override<a name="line.220"></a>
<span class="sourceLineNo">221</span>                public void close(Throwable cause) {<a name="line.221"></a>
<span class="sourceLineNo">222</span>                    TCPNetwork.this.log.error("stopping " + this + " due to exception", cause);<a name="line.222"></a>
<span class="sourceLineNo">223</span>                    TCPNetwork.this.stop();<a name="line.223"></a>
<span class="sourceLineNo">224</span>                }<a name="line.224"></a>
<span class="sourceLineNo">225</span>            });<a name="line.225"></a>
<span class="sourceLineNo">226</span>            this.selectForAccept(true);<a name="line.226"></a>
<span class="sourceLineNo">227</span>            this.serviceThread = new ServiceThread();<a name="line.227"></a>
<span class="sourceLineNo">228</span>            this.serviceThread.start();<a name="line.228"></a>
<span class="sourceLineNo">229</span>            this.executor = Executors.newSingleThreadExecutor();<a name="line.229"></a>
<span class="sourceLineNo">230</span>            this.handler = handler;<a name="line.230"></a>
<span class="sourceLineNo">231</span>            successful = true;<a name="line.231"></a>
<span class="sourceLineNo">232</span>        } finally {<a name="line.232"></a>
<span class="sourceLineNo">233</span>            if (!successful)<a name="line.233"></a>
<span class="sourceLineNo">234</span>                this.stop();<a name="line.234"></a>
<span class="sourceLineNo">235</span>        }<a name="line.235"></a>
<span class="sourceLineNo">236</span>    }<a name="line.236"></a>
<span class="sourceLineNo">237</span><a name="line.237"></a>
<span class="sourceLineNo">238</span>    /**<a name="line.238"></a>
<span class="sourceLineNo">239</span>     * Stop this instance.<a name="line.239"></a>
<span class="sourceLineNo">240</span>     *<a name="line.240"></a>
<span class="sourceLineNo">241</span>     * &lt;p&gt;<a name="line.241"></a>
<span class="sourceLineNo">242</span>     * Does nothing if already stopped.<a name="line.242"></a>
<span class="sourceLineNo">243</span>     * &lt;/p&gt;<a name="line.243"></a>
<span class="sourceLineNo">244</span>     */<a name="line.244"></a>
<span class="sourceLineNo">245</span>    public void stop() {<a name="line.245"></a>
<span class="sourceLineNo">246</span>        Thread waitForThread = null;<a name="line.246"></a>
<span class="sourceLineNo">247</span>        synchronized (this) {<a name="line.247"></a>
<span class="sourceLineNo">248</span>            if (this.serviceThread != null &amp;&amp; this.log.isDebugEnabled())<a name="line.248"></a>
<span class="sourceLineNo">249</span>                this.log.debug("stopping " + this);<a name="line.249"></a>
<span class="sourceLineNo">250</span>            if (this.serverSocketChannel != null) {<a name="line.250"></a>
<span class="sourceLineNo">251</span>                try {<a name="line.251"></a>
<span class="sourceLineNo">252</span>                    this.serverSocketChannel.close();<a name="line.252"></a>
<span class="sourceLineNo">253</span>                } catch (IOException e) {<a name="line.253"></a>
<span class="sourceLineNo">254</span>                    // ignore<a name="line.254"></a>
<span class="sourceLineNo">255</span>                }<a name="line.255"></a>
<span class="sourceLineNo">256</span>                this.serverSocketChannel = null;<a name="line.256"></a>
<span class="sourceLineNo">257</span>            }<a name="line.257"></a>
<span class="sourceLineNo">258</span>            if (this.selector != null) {<a name="line.258"></a>
<span class="sourceLineNo">259</span>                try {<a name="line.259"></a>
<span class="sourceLineNo">260</span>                    this.selector.close();<a name="line.260"></a>
<span class="sourceLineNo">261</span>                } catch (IOException e) {<a name="line.261"></a>
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<span class="sourceLineNo">264</span>                this.selector = null;<a name="line.264"></a>
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<span class="sourceLineNo">266</span>            if (this.serviceThread != null) {<a name="line.266"></a>
<span class="sourceLineNo">267</span>                this.serviceThread.interrupt();<a name="line.267"></a>
<span class="sourceLineNo">268</span>                if (!this.serviceThread.equals(Thread.currentThread()))<a name="line.268"></a>
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<span class="sourceLineNo">270</span>                this.serviceThread = null;<a name="line.270"></a>
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<span class="sourceLineNo">272</span>            if (this.executor != null) {<a name="line.272"></a>
<span class="sourceLineNo">273</span>                this.executor.shutdownNow();<a name="line.273"></a>
<span class="sourceLineNo">274</span>                try {<a name="line.274"></a>
<span class="sourceLineNo">275</span>                    this.executor.awaitTermination(1000, TimeUnit.MILLISECONDS);<a name="line.275"></a>
<span class="sourceLineNo">276</span>                } catch (InterruptedException e) {<a name="line.276"></a>
<span class="sourceLineNo">277</span>                    Thread.currentThread().interrupt();<a name="line.277"></a>
<span class="sourceLineNo">278</span>                }<a name="line.278"></a>
<span class="sourceLineNo">279</span>                this.executor = null;<a name="line.279"></a>
<span class="sourceLineNo">280</span>            }<a name="line.280"></a>
<span class="sourceLineNo">281</span>            this.selectionKey = null;<a name="line.281"></a>
<span class="sourceLineNo">282</span>            this.handler = null;<a name="line.282"></a>
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<span class="sourceLineNo">284</span>        if (waitForThread != null) {<a name="line.284"></a>
<span class="sourceLineNo">285</span>            try {<a name="line.285"></a>
<span class="sourceLineNo">286</span>                waitForThread.join();<a name="line.286"></a>
<span class="sourceLineNo">287</span>            } catch (InterruptedException e) {<a name="line.287"></a>
<span class="sourceLineNo">288</span>                this.log.debug("interrupted while stopping " + this + ", giving up");<a name="line.288"></a>
<span class="sourceLineNo">289</span>                Thread.currentThread().interrupt();<a name="line.289"></a>
<span class="sourceLineNo">290</span>            }<a name="line.290"></a>
<span class="sourceLineNo">291</span>        }<a name="line.291"></a>
<span class="sourceLineNo">292</span>    }<a name="line.292"></a>
<span class="sourceLineNo">293</span><a name="line.293"></a>
<span class="sourceLineNo">294</span>// Network<a name="line.294"></a>
<span class="sourceLineNo">295</span><a name="line.295"></a>
<span class="sourceLineNo">296</span>    @Override<a name="line.296"></a>
<span class="sourceLineNo">297</span>    public synchronized boolean send(String peer, ByteBuffer msg) {<a name="line.297"></a>
<span class="sourceLineNo">298</span><a name="line.298"></a>
<span class="sourceLineNo">299</span>        // Sanity check<a name="line.299"></a>
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<span class="sourceLineNo">301</span>            throw new IllegalArgumentException("null peer");<a name="line.301"></a>
<span class="sourceLineNo">302</span><a name="line.302"></a>
<span class="sourceLineNo">303</span>        // Get/create connection<a name="line.303"></a>
<span class="sourceLineNo">304</span>        Connection connection = this.connectionMap.get(peer);<a name="line.304"></a>
<span class="sourceLineNo">305</span>        if (connection == null) {<a name="line.305"></a>
<span class="sourceLineNo">306</span><a name="line.306"></a>
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<span class="sourceLineNo">308</span>            try {<a name="line.308"></a>
<span class="sourceLineNo">309</span>                connection = this.createConnection(peer);<a name="line.309"></a>
<span class="sourceLineNo">310</span>            } catch (IOException e) {<a name="line.310"></a>
<span class="sourceLineNo">311</span>                this.log.info(this + " unable to send message to `" + peer + "': " + e.getMessage());<a name="line.311"></a>
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<span class="sourceLineNo">314</span><a name="line.314"></a>
<span class="sourceLineNo">315</span>            // Record connection<a name="line.315"></a>
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<span class="sourceLineNo">318</span><a name="line.318"></a>
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<span class="sourceLineNo">322</span><a name="line.322"></a>
<span class="sourceLineNo">323</span>// Subclass methods<a name="line.323"></a>
<span class="sourceLineNo">324</span><a name="line.324"></a>
<span class="sourceLineNo">325</span>    /**<a name="line.325"></a>
<span class="sourceLineNo">326</span>     * Configure the {@link ServerSocketChannel} to be used by this instance. This method is invoked by {@link #start}.<a name="line.326"></a>
<span class="sourceLineNo">327</span>     *<a name="line.327"></a>
<span class="sourceLineNo">328</span>     * &lt;p&gt;<a name="line.328"></a>
<span class="sourceLineNo">329</span>     * The implementation in {@link TCPNetwork} does nothing. Subclasses may override to configure socket options, etc.<a name="line.329"></a>
<span class="sourceLineNo">330</span>     * &lt;/p&gt;<a name="line.330"></a>
<span class="sourceLineNo">331</span>     *<a name="line.331"></a>
<span class="sourceLineNo">332</span>     * @param serverSocketChannel channel to configure<a name="line.332"></a>
<span class="sourceLineNo">333</span>     */<a name="line.333"></a>
<span class="sourceLineNo">334</span>    protected void configureServerSocketChannel(ServerSocketChannel serverSocketChannel) {<a name="line.334"></a>
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<span class="sourceLineNo">336</span><a name="line.336"></a>
<span class="sourceLineNo">337</span>    /**<a name="line.337"></a>
<span class="sourceLineNo">338</span>     * Configure a new {@link SocketChannel} to be used by this instance. This method is invoked when new connections<a name="line.338"></a>
<span class="sourceLineNo">339</span>     * are created.<a name="line.339"></a>
<span class="sourceLineNo">340</span>     *<a name="line.340"></a>
<span class="sourceLineNo">341</span>     * &lt;p&gt;<a name="line.341"></a>
<span class="sourceLineNo">342</span>     * The implementation in {@link TCPNetwork} does nothing. Subclasses may override to configure socket options, etc.<a name="line.342"></a>
<span class="sourceLineNo">343</span>     * &lt;/p&gt;<a name="line.343"></a>
<span class="sourceLineNo">344</span>     *<a name="line.344"></a>
<span class="sourceLineNo">345</span>     * @param socketChannel channel to configure<a name="line.345"></a>
<span class="sourceLineNo">346</span>     */<a name="line.346"></a>
<span class="sourceLineNo">347</span>    protected void configureSocketChannel(SocketChannel socketChannel) {<a name="line.347"></a>
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<span class="sourceLineNo">349</span><a name="line.349"></a>
<span class="sourceLineNo">350</span>// Object<a name="line.350"></a>
<span class="sourceLineNo">351</span><a name="line.351"></a>
<span class="sourceLineNo">352</span>    @Override<a name="line.352"></a>
<span class="sourceLineNo">353</span>    public String toString() {<a name="line.353"></a>
<span class="sourceLineNo">354</span>        return this.getClass().getSimpleName() + "[port=" + this.listenAddress.getPort() + "]";<a name="line.354"></a>
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<span class="sourceLineNo">356</span><a name="line.356"></a>
<span class="sourceLineNo">357</span>// I/O Ready Conditions<a name="line.357"></a>
<span class="sourceLineNo">358</span><a name="line.358"></a>
<span class="sourceLineNo">359</span>    // Invoked when we have a new incoming connection<a name="line.359"></a>
<span class="sourceLineNo">360</span>    private void handleAccept() throws IOException {<a name="line.360"></a>
<span class="sourceLineNo">361</span><a name="line.361"></a>
<span class="sourceLineNo">362</span>        // Sanity check<a name="line.362"></a>
<span class="sourceLineNo">363</span>        assert TCPNetwork.isServiceThread();<a name="line.363"></a>
<span class="sourceLineNo">364</span><a name="line.364"></a>
<span class="sourceLineNo">365</span>        // Check connection size limit<a name="line.365"></a>
<span class="sourceLineNo">366</span>        if (this.connectionMap.size() &gt;= this.maxConnections) {<a name="line.366"></a>
<span class="sourceLineNo">367</span>            this.log.warn("too many network connections (" + this.connectionMap.size() + " &gt;= "<a name="line.367"></a>
<span class="sourceLineNo">368</span>              + this.maxConnections + "), not accepting any more (for now)");<a name="line.368"></a>
<span class="sourceLineNo">369</span>            this.selectForAccept(false);<a name="line.369"></a>
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<span class="sourceLineNo">372</span><a name="line.372"></a>
<span class="sourceLineNo">373</span>        // Accept connection<a name="line.373"></a>
<span class="sourceLineNo">374</span>        SocketChannel socketChannel = this.serverSocketChannel.accept();<a name="line.374"></a>
<span class="sourceLineNo">375</span>        if (socketChannel == null)<a name="line.375"></a>
<span class="sourceLineNo">376</span>            return;<a name="line.376"></a>
<span class="sourceLineNo">377</span>        this.log.info("accepted incoming connection from " + socketChannel.getRemoteAddress());<a name="line.377"></a>
<span class="sourceLineNo">378</span>        socketChannel.configureBlocking(false);<a name="line.378"></a>
<span class="sourceLineNo">379</span><a name="line.379"></a>
<span class="sourceLineNo">380</span>        // Create peer<a name="line.380"></a>
<span class="sourceLineNo">381</span>        final InetSocketAddress remote = (InetSocketAddress)socketChannel.socket().getRemoteSocketAddress();<a name="line.381"></a>
<span class="sourceLineNo">382</span>        final String peer = remote.getHostString() + (remote.getPort() != DEFAULT_TCP_PORT ? ":" + remote.getPort() : "");<a name="line.382"></a>
<span class="sourceLineNo">383</span><a name="line.383"></a>
<span class="sourceLineNo">384</span>        // Are we already connected to this peer? If so (deterministically) choose which connection wins<a name="line.384"></a>
<span class="sourceLineNo">385</span>        Connection connection = this.connectionMap.get(peer);<a name="line.385"></a>
<span class="sourceLineNo">386</span>        if (connection != null) {<a name="line.386"></a>
<span class="sourceLineNo">387</span><a name="line.387"></a>
<span class="sourceLineNo">388</span>            // Compare the socket addresses of the initiator side of each connection<a name="line.388"></a>
<span class="sourceLineNo">389</span>            final SocketAddress oldAddr = (InetSocketAddress)connection.getSocketChannel().socket().getLocalSocketAddress();<a name="line.389"></a>
<span class="sourceLineNo">390</span>            final SocketAddress newAddr = (InetSocketAddress)socketChannel.getRemoteAddress();<a name="line.390"></a>
<span class="sourceLineNo">391</span>            final String oldDesc = oldAddr.toString().replaceAll("^[^/]*/", "");            // strip off hostname part, if any<a name="line.391"></a>
<span class="sourceLineNo">392</span>            final String newDesc = newAddr.toString().replaceAll("^[^/]*/", "");            // strip off hostname part, if any<a name="line.392"></a>
<span class="sourceLineNo">393</span>            final int diff = newDesc.compareTo(oldDesc);<a name="line.393"></a>
<span class="sourceLineNo">394</span>            this.log.info("connection mid-air collision: old: " + oldDesc + ", new: " + newDesc<a name="line.394"></a>
<span class="sourceLineNo">395</span>              + ", winner: " + (diff &lt; 0 ? "new" : diff &gt; 0 ? "old" : "neither (?)"));<a name="line.395"></a>
<span class="sourceLineNo">396</span><a name="line.396"></a>
<span class="sourceLineNo">397</span>            // Close the loser(s)<a name="line.397"></a>
<span class="sourceLineNo">398</span>            if (diff &gt;= 0) {<a name="line.398"></a>
<span class="sourceLineNo">399</span>                this.log.info("rejecting incoming connection from " + socketChannel.getRemoteAddress() + " as duplicate");<a name="line.399"></a>
<span class="sourceLineNo">400</span>                socketChannel.close();<a name="line.400"></a>
<span class="sourceLineNo">401</span>                socketChannel = null;<a name="line.401"></a>
<span class="sourceLineNo">402</span>            }<a name="line.402"></a>
<span class="sourceLineNo">403</span>            if (diff &lt;= 0) {<a name="line.403"></a>
<span class="sourceLineNo">404</span>                this.log.info("closing existing duplicate connection to " + socketChannel.getRemoteAddress());<a name="line.404"></a>
<span class="sourceLineNo">405</span>                this.connectionMap.remove(peer);<a name="line.405"></a>
<span class="sourceLineNo">406</span>                connection.close(new IOException("duplicate connection"));<a name="line.406"></a>
<span class="sourceLineNo">407</span>                connection = null;<a name="line.407"></a>
<span class="sourceLineNo">408</span>            }<a name="line.408"></a>
<span class="sourceLineNo">409</span>        }<a name="line.409"></a>
<span class="sourceLineNo">410</span><a name="line.410"></a>
<span class="sourceLineNo">411</span>        // Create connection from new socket if needed<a name="line.411"></a>
<span class="sourceLineNo">412</span>        if (connection == null &amp;&amp; socketChannel != null) {<a name="line.412"></a>
<span class="sourceLineNo">413</span>            connection = new Connection(this, this.selector, peer, socketChannel);<a name="line.413"></a>
<span class="sourceLineNo">414</span>            this.connectionMap.put(peer, connection);<a name="line.414"></a>
<span class="sourceLineNo">415</span>            this.handleOutputQueueEmpty(connection);<a name="line.415"></a>
<span class="sourceLineNo">416</span>        }<a name="line.416"></a>
<span class="sourceLineNo">417</span>    }<a name="line.417"></a>
<span class="sourceLineNo">418</span><a name="line.418"></a>
<span class="sourceLineNo">419</span>    // Enable/disable incoming connections<a name="line.419"></a>
<span class="sourceLineNo">420</span>    private void selectForAccept(boolean enabled) throws IOException {<a name="line.420"></a>
<span class="sourceLineNo">421</span>        if (this.selectionKey == null)<a name="line.421"></a>
<span class="sourceLineNo">422</span>            return;<a name="line.422"></a>
<span class="sourceLineNo">423</span>        if (enabled &amp;&amp; (this.selectionKey.interestOps() &amp; SelectionKey.OP_ACCEPT) == 0) {<a name="line.423"></a>
<span class="sourceLineNo">424</span>            this.selectFor(this.selectionKey, SelectionKey.OP_ACCEPT, true);<a name="line.424"></a>
<span class="sourceLineNo">425</span>            if (this.log.isDebugEnabled())<a name="line.425"></a>
<span class="sourceLineNo">426</span>                this.log.debug(this + " started listening for incoming connections");<a name="line.426"></a>
<span class="sourceLineNo">427</span>        } else if (!enabled &amp;&amp; (this.selectionKey.interestOps() &amp; SelectionKey.OP_ACCEPT) != 0) {<a name="line.427"></a>
<span class="sourceLineNo">428</span>            this.selectFor(this.selectionKey, SelectionKey.OP_ACCEPT, false);<a name="line.428"></a>
<span class="sourceLineNo">429</span>            if (this.log.isDebugEnabled())<a name="line.429"></a>
<span class="sourceLineNo">430</span>                this.log.debug(this + " stopped listening for incoming connections");<a name="line.430"></a>
<span class="sourceLineNo">431</span>        }<a name="line.431"></a>
<span class="sourceLineNo">432</span>    }<a name="line.432"></a>
<span class="sourceLineNo">433</span><a name="line.433"></a>
<span class="sourceLineNo">434</span>// Connection API<a name="line.434"></a>
<span class="sourceLineNo">435</span><a name="line.435"></a>
<span class="sourceLineNo">436</span>    // Invoked when a message arrives on a connection<a name="line.436"></a>
<span class="sourceLineNo">437</span>    void handleMessage(final Connection connection, final ByteBuffer msg) {<a name="line.437"></a>
<span class="sourceLineNo">438</span>        assert Thread.holdsLock(this);<a name="line.438"></a>
<span class="sourceLineNo">439</span>        assert TCPNetwork.isServiceThread();<a name="line.439"></a>
<span class="sourceLineNo">440</span>        this.executor.submit(new Runnable() {<a name="line.440"></a>
<span class="sourceLineNo">441</span>            @Override<a name="line.441"></a>
<span class="sourceLineNo">442</span>            public void run() {<a name="line.442"></a>
<span class="sourceLineNo">443</span>                try {<a name="line.443"></a>
<span class="sourceLineNo">444</span>                    TCPNetwork.this.handler.handle(connection.getPeer(), msg);<a name="line.444"></a>
<span class="sourceLineNo">445</span>                } catch (Throwable t) {<a name="line.445"></a>
<span class="sourceLineNo">446</span>                    TCPNetwork.this.log.error("exception in callback", t);<a name="line.446"></a>
<span class="sourceLineNo">447</span>                }<a name="line.447"></a>
<span class="sourceLineNo">448</span>            }<a name="line.448"></a>
<span class="sourceLineNo">449</span>        });<a name="line.449"></a>
<span class="sourceLineNo">450</span>    }<a name="line.450"></a>
<span class="sourceLineNo">451</span><a name="line.451"></a>
<span class="sourceLineNo">452</span>    // Invoked a connection's output queue goes empty<a name="line.452"></a>
<span class="sourceLineNo">453</span>    void handleOutputQueueEmpty(final Connection connection) {<a name="line.453"></a>
<span class="sourceLineNo">454</span>        assert Thread.holdsLock(this);<a name="line.454"></a>
<span class="sourceLineNo">455</span>        assert TCPNetwork.isServiceThread();<a name="line.455"></a>
<span class="sourceLineNo">456</span>        this.executor.submit(new Runnable() {<a name="line.456"></a>
<span class="sourceLineNo">457</span>            @Override<a name="line.457"></a>
<span class="sourceLineNo">458</span>            public void run() {<a name="line.458"></a>
<span class="sourceLineNo">459</span>                try {<a name="line.459"></a>
<span class="sourceLineNo">460</span>                    TCPNetwork.this.handler.outputQueueEmpty(connection.getPeer());<a name="line.460"></a>
<span class="sourceLineNo">461</span>                } catch (Throwable t) {<a name="line.461"></a>
<span class="sourceLineNo">462</span>                    TCPNetwork.this.log.error("exception in callback", t);<a name="line.462"></a>
<span class="sourceLineNo">463</span>                }<a name="line.463"></a>
<span class="sourceLineNo">464</span>            }<a name="line.464"></a>
<span class="sourceLineNo">465</span>        });<a name="line.465"></a>
<span class="sourceLineNo">466</span>    }<a name="line.466"></a>
<span class="sourceLineNo">467</span><a name="line.467"></a>
<span class="sourceLineNo">468</span>    // Invoked when a connection closes<a name="line.468"></a>
<span class="sourceLineNo">469</span>    void handleConnectionClosed(Connection connection) {<a name="line.469"></a>
<span class="sourceLineNo">470</span>        assert Thread.holdsLock(this);<a name="line.470"></a>
<span class="sourceLineNo">471</span>        assert TCPNetwork.isServiceThread();<a name="line.471"></a>
<span class="sourceLineNo">472</span>        if (this.log.isDebugEnabled())<a name="line.472"></a>
<span class="sourceLineNo">473</span>            this.log.debug(this + " handling closed connection " + connection);<a name="line.473"></a>
<span class="sourceLineNo">474</span>        this.connectionMap.remove(connection.getPeer());<a name="line.474"></a>
<span class="sourceLineNo">475</span>        this.wakeup();<a name="line.475"></a>
<span class="sourceLineNo">476</span>    }<a name="line.476"></a>
<span class="sourceLineNo">477</span><a name="line.477"></a>
<span class="sourceLineNo">478</span>    // Wakeup service thread<a name="line.478"></a>
<span class="sourceLineNo">479</span>    void wakeup() {<a name="line.479"></a>
<span class="sourceLineNo">480</span>        assert Thread.holdsLock(this);<a name="line.480"></a>
<span class="sourceLineNo">481</span>        if (this.log.isTraceEnabled())<a name="line.481"></a>
<span class="sourceLineNo">482</span>            this.log.trace("wakeup service thread");<a name="line.482"></a>
<span class="sourceLineNo">483</span>        if (this.selector != null)<a name="line.483"></a>
<span class="sourceLineNo">484</span>            this.selector.wakeup();<a name="line.484"></a>
<span class="sourceLineNo">485</span>    }<a name="line.485"></a>
<span class="sourceLineNo">486</span><a name="line.486"></a>
<span class="sourceLineNo">487</span>// Internal API<a name="line.487"></a>
<span class="sourceLineNo">488</span><a name="line.488"></a>
<span class="sourceLineNo">489</span>    // Create a new connection to the specified peer<a name="line.489"></a>
<span class="sourceLineNo">490</span>    private synchronized Connection createConnection(String peer) throws IOException {<a name="line.490"></a>
<span class="sourceLineNo">491</span><a name="line.491"></a>
<span class="sourceLineNo">492</span>        // Create new one<a name="line.492"></a>
<span class="sourceLineNo">493</span>        final SocketChannel socketChannel = SocketChannel.open();<a name="line.493"></a>
<span class="sourceLineNo">494</span>        this.configureSocketChannel(socketChannel);<a name="line.494"></a>
<span class="sourceLineNo">495</span>        socketChannel.configureBlocking(false);<a name="line.495"></a>
<span class="sourceLineNo">496</span>        if (this.log.isDebugEnabled())<a name="line.496"></a>
<span class="sourceLineNo">497</span>            this.log.debug(this + " looking up peer address `" + peer + "'");<a name="line.497"></a>
<span class="sourceLineNo">498</span><a name="line.498"></a>
<span class="sourceLineNo">499</span>        // Resolve peer name into a socket address<a name="line.499"></a>
<span class="sourceLineNo">500</span>        final Matcher matcher = Pattern.compile("(.+)(:([0-9]+))?").matcher(peer);<a name="line.500"></a>
<span class="sourceLineNo">501</span>        InetSocketAddress socketAddress = null;<a name="line.501"></a>
<span class="sourceLineNo">502</span>        if (matcher.matches()) {<a name="line.502"></a>
<span class="sourceLineNo">503</span>            try {<a name="line.503"></a>
<span class="sourceLineNo">504</span>                socketAddress = new InetSocketAddress(matcher.group(1),<a name="line.504"></a>
<span class="sourceLineNo">505</span>                  matcher.group(3) != null ? Integer.parseInt(matcher.group(3)) : DEFAULT_TCP_PORT);<a name="line.505"></a>
<span class="sourceLineNo">506</span>            } catch (IllegalArgumentException e) {<a name="line.506"></a>
<span class="sourceLineNo">507</span>                if (this.log.isTraceEnabled())<a name="line.507"></a>
<span class="sourceLineNo">508</span>                    this.log.trace(this + " peer address `" + peer + "' is invalid", e);<a name="line.508"></a>
<span class="sourceLineNo">509</span>            }<a name="line.509"></a>
<span class="sourceLineNo">510</span>        }<a name="line.510"></a>
<span class="sourceLineNo">511</span>        if (socketAddress == null || socketAddress.isUnresolved())<a name="line.511"></a>
<span class="sourceLineNo">512</span>            throw new IOException("invalid or unresolvable peer address `" + peer + "'");<a name="line.512"></a>
<span class="sourceLineNo">513</span><a name="line.513"></a>
<span class="sourceLineNo">514</span>        // Initiate connection to peer<a name="line.514"></a>
<span class="sourceLineNo">515</span>        if (this.log.isDebugEnabled()) {<a name="line.515"></a>
<span class="sourceLineNo">516</span>            this.log.debug(this + ": resolved peer address `" + peer + "' to " + socketAddress.getAddress()<a name="line.516"></a>
<span class="sourceLineNo">517</span>              + "; now initiating connection");<a name="line.517"></a>
<span class="sourceLineNo">518</span>        }<a name="line.518"></a>
<span class="sourceLineNo">519</span>        socketChannel.connect(socketAddress);<a name="line.519"></a>
<span class="sourceLineNo">520</span><a name="line.520"></a>
<span class="sourceLineNo">521</span>        // Create new connection<a name="line.521"></a>
<span class="sourceLineNo">522</span>        return new Connection(this, this.selector, peer, socketChannel);<a name="line.522"></a>
<span class="sourceLineNo">523</span>    }<a name="line.523"></a>
<span class="sourceLineNo">524</span><a name="line.524"></a>
<span class="sourceLineNo">525</span>// Service loop<a name="line.525"></a>
<span class="sourceLineNo">526</span><a name="line.526"></a>
<span class="sourceLineNo">527</span>    private void service() throws IOException {<a name="line.527"></a>
<span class="sourceLineNo">528</span>        assert TCPNetwork.isServiceThread();<a name="line.528"></a>
<span class="sourceLineNo">529</span>        while (true) {<a name="line.529"></a>
<span class="sourceLineNo">530</span><a name="line.530"></a>
<span class="sourceLineNo">531</span>            // Check if we're still open<a name="line.531"></a>
<span class="sourceLineNo">532</span>            final Selector currentSelector;<a name="line.532"></a>
<span class="sourceLineNo">533</span>            synchronized (this) {<a name="line.533"></a>
<span class="sourceLineNo">534</span>                currentSelector = this.selector;<a name="line.534"></a>
<span class="sourceLineNo">535</span>            }<a name="line.535"></a>
<span class="sourceLineNo">536</span>            if (currentSelector == null)<a name="line.536"></a>
<span class="sourceLineNo">537</span>                break;<a name="line.537"></a>
<span class="sourceLineNo">538</span><a name="line.538"></a>
<span class="sourceLineNo">539</span>            // Wait for I/O readiness, timeout, or shutdown<a name="line.539"></a>
<span class="sourceLineNo">540</span>            try {<a name="line.540"></a>
<span class="sourceLineNo">541</span>                if (this.log.isTraceEnabled())<a name="line.541"></a>
<span class="sourceLineNo">542</span>                    this.log.trace("[SVC THREAD]: sleeping: keys=" + dbg(currentSelector.keys()));<a name="line.542"></a>
<span class="sourceLineNo">543</span>                currentSelector.select(1000L);<a name="line.543"></a>
<span class="sourceLineNo">544</span>            } catch (ClosedSelectorException e) {               // close() was invoked<a name="line.544"></a>
<span class="sourceLineNo">545</span>                break;<a name="line.545"></a>
<span class="sourceLineNo">546</span>            }<a name="line.546"></a>
<span class="sourceLineNo">547</span>            if (Thread.interrupted())<a name="line.547"></a>
<span class="sourceLineNo">548</span>                break;<a name="line.548"></a>
<span class="sourceLineNo">549</span><a name="line.549"></a>
<span class="sourceLineNo">550</span>            // Figure out what has happened<a name="line.550"></a>
<span class="sourceLineNo">551</span>            synchronized (this) {<a name="line.551"></a>
<span class="sourceLineNo">552</span><a name="line.552"></a>
<span class="sourceLineNo">553</span>                // Are we shutting down?<a name="line.553"></a>
<span class="sourceLineNo">554</span>                if (this.selector == null) {<a name="line.554"></a>
<span class="sourceLineNo">555</span>                    for (Connection connection : new ArrayList&lt;Connection&gt;(this.connectionMap.values()))<a name="line.555"></a>
<span class="sourceLineNo">556</span>                        connection.close(null);<a name="line.556"></a>
<span class="sourceLineNo">557</span>                    break;<a name="line.557"></a>
<span class="sourceLineNo">558</span>                }<a name="line.558"></a>
<span class="sourceLineNo">559</span><a name="line.559"></a>
<span class="sourceLineNo">560</span>                // Handle any ready I/O<a name="line.560"></a>
<span class="sourceLineNo">561</span>                if (this.log.isTraceEnabled())<a name="line.561"></a>
<span class="sourceLineNo">562</span>                    this.log.trace("[SVC THREAD]: awake: selectedKeys=" + dbg(currentSelector.selectedKeys()));<a name="line.562"></a>
<span class="sourceLineNo">563</span>                for (Iterator&lt;SelectionKey&gt; i = selector.selectedKeys().iterator(); i.hasNext(); ) {<a name="line.563"></a>
<span class="sourceLineNo">564</span>                    final SelectionKey key = i.next();<a name="line.564"></a>
<span class="sourceLineNo">565</span>                    i.remove();<a name="line.565"></a>
<span class="sourceLineNo">566</span>                    final IOHandler ioHandler = (IOHandler)key.attachment();<a name="line.566"></a>
<span class="sourceLineNo">567</span>                    if (this.log.isTraceEnabled())<a name="line.567"></a>
<span class="sourceLineNo">568</span>                        this.log.trace("[SVC THREAD]: I/O ready: key=" + dbg(key) + " handler=" + ioHandler);<a name="line.568"></a>
<span class="sourceLineNo">569</span>                    try {<a name="line.569"></a>
<span class="sourceLineNo">570</span>                        ioHandler.serviceIO(key);<a name="line.570"></a>
<span class="sourceLineNo">571</span>                    } catch (IOException e) {<a name="line.571"></a>
<span class="sourceLineNo">572</span>                        if (this.log.isDebugEnabled())<a name="line.572"></a>
<span class="sourceLineNo">573</span>                            this.log.debug("I/O error from " + ioHandler, e);<a name="line.573"></a>
<span class="sourceLineNo">574</span>                        ioHandler.close(e);<a name="line.574"></a>
<span class="sourceLineNo">575</span>                    } catch (Exception e) {<a name="line.575"></a>
<span class="sourceLineNo">576</span>                        this.log.error("service error from " + ioHandler, e);<a name="line.576"></a>
<span class="sourceLineNo">577</span>                        ioHandler.close(e);<a name="line.577"></a>
<span class="sourceLineNo">578</span>                    }<a name="line.578"></a>
<span class="sourceLineNo">579</span>                }<a name="line.579"></a>
<span class="sourceLineNo">580</span><a name="line.580"></a>
<span class="sourceLineNo">581</span>                // Perform connection housekeeping<a name="line.581"></a>
<span class="sourceLineNo">582</span>                for (Connection connection : new ArrayList&lt;Connection&gt;(this.connectionMap.values())) {<a name="line.582"></a>
<span class="sourceLineNo">583</span>                    try {<a name="line.583"></a>
<span class="sourceLineNo">584</span>                        connection.performHousekeeping();<a name="line.584"></a>
<span class="sourceLineNo">585</span>                    } catch (IOException e) {<a name="line.585"></a>
<span class="sourceLineNo">586</span>                        if (this.log.isDebugEnabled())<a name="line.586"></a>
<span class="sourceLineNo">587</span>                            this.log.debug("I/O error from " + connection, e);<a name="line.587"></a>
<span class="sourceLineNo">588</span>                        connection.close(e);<a name="line.588"></a>
<span class="sourceLineNo">589</span>                    } catch (Exception e) {<a name="line.589"></a>
<span class="sourceLineNo">590</span>                        this.log.error("error performing housekeeping for " + connection, e);<a name="line.590"></a>
<span class="sourceLineNo">591</span>                        connection.close(e);<a name="line.591"></a>
<span class="sourceLineNo">592</span>                    }<a name="line.592"></a>
<span class="sourceLineNo">593</span>                }<a name="line.593"></a>
<span class="sourceLineNo">594</span><a name="line.594"></a>
<span class="sourceLineNo">595</span>                // Perform my own housekeeping<a name="line.595"></a>
<span class="sourceLineNo">596</span>                this.selectForAccept(this.connectionMap.size() &lt; this.maxConnections);<a name="line.596"></a>
<span class="sourceLineNo">597</span>            }<a name="line.597"></a>
<span class="sourceLineNo">598</span>        }<a name="line.598"></a>
<span class="sourceLineNo">599</span>    }<a name="line.599"></a>
<span class="sourceLineNo">600</span><a name="line.600"></a>
<span class="sourceLineNo">601</span>// Service thread<a name="line.601"></a>
<span class="sourceLineNo">602</span><a name="line.602"></a>
<span class="sourceLineNo">603</span>    private class ServiceThread extends Thread {<a name="line.603"></a>
<span class="sourceLineNo">604</span><a name="line.604"></a>
<span class="sourceLineNo">605</span>        public ServiceThread() {<a name="line.605"></a>
<span class="sourceLineNo">606</span>            super("Service Thread for " + TCPNetwork.this);<a name="line.606"></a>
<span class="sourceLineNo">607</span>        }<a name="line.607"></a>
<span class="sourceLineNo">608</span><a name="line.608"></a>
<span class="sourceLineNo">609</span>        @Override<a name="line.609"></a>
<span class="sourceLineNo">610</span>        public void run() {<a name="line.610"></a>
<span class="sourceLineNo">611</span>            try {<a name="line.611"></a>
<span class="sourceLineNo">612</span>                TCPNetwork.this.service();<a name="line.612"></a>
<span class="sourceLineNo">613</span>            } catch (ThreadDeath t) {<a name="line.613"></a>
<span class="sourceLineNo">614</span>                throw t;<a name="line.614"></a>
<span class="sourceLineNo">615</span>            } catch (Throwable t) {<a name="line.615"></a>
<span class="sourceLineNo">616</span>                TCPNetwork.this.log.error("unexpected error in service thread", t);<a name="line.616"></a>
<span class="sourceLineNo">617</span>            }<a name="line.617"></a>
<span class="sourceLineNo">618</span>            if (TCPNetwork.this.log.isDebugEnabled())<a name="line.618"></a>
<span class="sourceLineNo">619</span>                TCPNetwork.this.log.debug(this + " exiting");<a name="line.619"></a>
<span class="sourceLineNo">620</span>        }<a name="line.620"></a>
<span class="sourceLineNo">621</span>    }<a name="line.621"></a>
<span class="sourceLineNo">622</span><a name="line.622"></a>
<span class="sourceLineNo">623</span>    static boolean isServiceThread() {<a name="line.623"></a>
<span class="sourceLineNo">624</span>        return Thread.currentThread() instanceof ServiceThread;<a name="line.624"></a>
<span class="sourceLineNo">625</span>    }<a name="line.625"></a>
<span class="sourceLineNo">626</span>}<a name="line.626"></a>
<span class="sourceLineNo">627</span><a name="line.627"></a>




























































</pre>
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